Ventilator



m yen May 2, 1961 H. MOHRMAN 2,982,198

VENTILATOR Filed Nov. 13, 1958 2 Sheets-Sheet 1 4 25' 45; j- ..I Ar 1. 4

ATTORNEY y 1951 H L. MOHRMAN 2,982,198

VENTILATOR Filed Nov. 13, 1958 2 Sheets-Sheet 2 ORNEY VENTILATOR HarryL. Mohrman, Caldwell, N.J., asslgnor to Chelsea Filed Nov. 13, 1958,See. No. 773,642

3 Claims. f (Cl. 98-43) This invention relates to an exhaust device tobe secured to the exhaust'opening of an object, as, for example, of aroof or other part of a building. Pursuant to the nvention, novel meansare provided for effectively movmg a1r around and away from the motor tocool the same w1thout contamination by or mixture with airsimultaneously exhausted out of said exhaust opening and by the fanwheel driven by the motor. The drawings show forms illustrative of theinvention as hereinbelow more particularly described.

In the drawings:

Fig. 1 is a vertical, partly sectional view of a device embodying theinvention, taken at line 11 of Fig. 4,

Fig. 2 is a fragmentary, enlarged, sectional view of another form ofmounting for the motor housing shell on the deflector dome,

Fig. 3 is an enlarged perspective view of the mounting arrangement shownin Fig. 1,

Fig. 4 is a fragmentary, transverse sectional view, taken at line 4-4 ofFig. 1,

Fig. 5 is a fragmentary, sectional view of the motor, the dome, motorhousing and associated parts of a modified form of the invention,

Fig. 6 is a fragmentary, perspective view of the top of a motor dome ofa further form thereof, and

Fig. 7 is a fragmentary, sectional view of the motor dome and motorhousing in another form of the invention.

As shown in the drawings, the exhaust device 15 of this invention isadapted for registry with the air exhaust opening, such as opening 10(Fig. l) of a roof or other object 11 to which the device of thisinvention may be secured. Said device 15 has a fan wheel 16 in spacedalignment with a motor 17 (or a motor driven shaft) and actuatedthereby, a motor housing shell 18 encircling the motor and spacedtherefrom, and a motor dome 19 secured in overlying spaced relation tothe motor housing shell 18 as for example by securing the complementaryregistering flanges 20, 21 of members 18, 19 together (in the Fig. 1form) by interengaging latch means such as bolts or the like 22. In thatarrangement the flow of atmospheric air' will be, as noted by the arrow23, between the motor housing shell 18 and the motor dome 19 and aroundthe motor 17, cooling the motor on actuation of the device. Fan 33 movessuch air, cooling the motor, downwardly as noted at 27 within the motorhousing shell 18, to mingle at 34 with atmospheric air drawn as at 26between the lower end of the motor housing shell 18 and the deflectordome 24, mingling then as at 28 interiorly of dome 24 with the evacuatedair drawn as at 30 by fan 16, and being swept therewith out of the lowerend of the dome 24 as at 31 by the action of fan 16.

The deflector dome 24 is disposed in the device to cover the perimeterof the fan wheel 16 in spaced relation thereto and deflect air exhaustedthereby to the atmosphere. A separator plate 25 (Figs. 2 and 3) isdisposed intermediate the motor housing shell and fan wheel andproportioned to substantially define a lower wall for the motor housingshell 18 enclosing the motor and separating it'from the fan wheel.

. United States Patent 0 2,982,198 Patented May 2, 1961 In the formshown in Figs. 1 and 3 means are provided for securing the motor base orseparator plate 25 to the deflector dome 24 in spaced relation, so thatair from the interior of motor housing shell 18, moving downwardly as at34 will mingle with atmospheric air moving inwardly of the devicethrough the opening 26 (Fig. 1) and dome 24, said mingled air thenflowing into the deflector dome as noted by the arrow 28 in Fig. l, onactuation of the device.

Where it is desired to seal the motor and air flowing around-the motorfrom air exhausted by fan 16 from opening 10, the separator plate 25(Fig. 2) may be secured directly to the fan wheel deflector dome 24,sealing the same at the point 34 which, in the Fig. 1 form, is

open.

In the Fig. 1 construction, the shaft of motor 17 is extended as at 32at the top of the motor; fan 33, keyed to said extended shaft 32, ispitched to direct the flow or" air downwardly (27). In the Fig. 2construction, fan 33 would be a centrifugal fan such as the blower typeshown at 16 in Fig. l, to ventilate the space under the motor housing18, moving such heated air out of the device, between the fianges 20, 21in a reverse direction to that indicated by arrow 23 in Fig. 1.

The separator plate 25 may be proportioned to substantially define alower wall for the motor housing shell 18 (Fig. 1), separating the motorfrom the fan wheel, as above mentioned. The circumferential edge (Fig.l) of the separator plate 25 terminates short of the motor housing shell18 and may be secured directly against (Fig. 2) or in spaced relation to(Figs. 1 and 3), the deflector dome 24 by any suitable means such asrubber shock mounts 36 secured to the parts by suitable bolt memberssuch as 35. The deflector dome 24 and parts associated therewith may besecured by bolt members 37 or the like to a barrel assembly 38 which, inturn, may be secured, as at 39, to a curb cap 40 secured to the curbbase 41 in any desired or convenient manner. The device may be providedwith rails 42, 43 (Fig. 4) extending transversely above the fan wheeland secured to the device as shown at 44, 45 and the motor secured tobracket 46. The bracket 46 might, instead, serve as a bearing for amotor shaft (where a belt drive, for example, is used). Complementarymeans 47 may be provided on the bracket and rails to secure the motor atthe desired position on the rails. In the Pigs. 5-7 forms the motor domeis keyed as at 50 to the armature shaft of the motor 17 and is providedwith the blades 51 which may be separate parts suitably secured theretoas in Fig. 5 or may be formed by pressing the material of said dome 19inwardly to unitarily form said blades as shown at 51a in Fig. 6. In theFig. 7 form, the blade 51b is formed unitarily with the dome 19 byforcing the material of the marginal flange of said dome inwardly asshown.

The term motor in this specification and claims shall be deemed to meaneither a motor such as shown at 17 or a motor driven shaft for rotatingthe fan wheel 16.

Examples of practical devices embodying the invention are describedherein and shown in the accompanying drawings; the invention is notlimited thereto, but covers all other forms coming within the scope orpurview of the disclosure herein.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A ventilator device for drawing air from an opening in, and definedby, a hollow deflector dome extending from a structure, said devicecomprising, means supporting said dome from said structure in spacedrelation to V and overlying said opening, a motor, a shell housing saidmotor, means engaging said shell and securing the lower end thereof tothe top of the deflector dome in spaced relation therewith for the flowof air therebetween, a motor support bracket, shock mounts positionedbetween said bracket and the deflector dome, a fan wheel operable bysaid motor and operating within the deflector dome, a separator plateproportioned to extend beyond the inner edge of the deflector dome,means securing the :outer marginal portion of said separator plate tothe -inner marginal portion of said deflector dome, a carrier said motorshell and overlying said motor, said cap having a dependent flangeoverlying the upper edge portion of said shell and leaving a space withrespect thereto to allow for the flow of air therebetween, means tocause circulation of air through said space, said means forming part ofthe cap to act as a fan to cause the circulation of air through thespace between the cap flange and the motor housing shell.

2.' In a ventilator device as set forth in claim 1, wherein said meansforming part of the cap to act as afan comprises blades on theundersurface of the cap.

3. In a ventilator device as set forth in claim 1, wherein saiddepending flange ofthe cap is formed unitarily with blade means formedinwardly of the cap form such a fan, said blade means formed inwardly ofthe cap comprising said means forming part of the cap to act as a fan.

References Cited in the'file of this patent UNITED STATES 'PATENTS2,526,290 .Solzman Oct. 17, 1950 2,582,902 Gohl Jan. 15, 1952 2,656,973Sutherland Oct. 27, 1953 2,711,682 Dreschel June 28, 1955 2,735,611McLean Feb. 21, 1956 2,767,904 Doyle Oct. 23, 1956 2,774,293 Jenn Dec.18, 1956 2,777,382 Solzman Jan. 15, 1957 2,823,598 ,Ienn, Feb. 18,19582,884,185 'Dolan Apr. 28, 1959

